Electrically-operated door-closure equipment for car park installation, executes two direction reversals as closed position is approached

摘要

The controller (4) ends door (2) movement as soon as the drive current exceeds a given maximum limit. The controller (5) then briefly operates the drive (3) in reverse. This action constitutes a first direction-reversal phase. Following this, the controller again reverses the drive direction. This moves the door in the original, closure direction, and constitutes the second direction-reversal phase. At the same time as this reversal, the given maximum value is raised by a set amount.